# What are the pros/cons of Trapped Ion Qubits, Superconducting Qubits and Si Spin Qubits?

Among available qubit technologies for universal quantum computing these 3 come up as promising. NV centers and Majorana qubits also underway but relatively new. I find superconducting qubits and Trapped Ion qubits very hard to scale. Also T1(decoherence) and T2 (dephasing) for superconducting qubits is very less (us).

Being a non-physicist, I am not able to exactly locate good sources to convince myself why is one technology preferred over the other? I would really appreciate if you can direct me to relavant literature available on this topic.